TPS3126E18DBVTG4

Overview

Category: Integrated Circuits (ICs)

Use: Power Management IC

Characteristics: - Low-power voltage supervisor with watchdog timer - Monitors undervoltage and overvoltage conditions - Provides a reset signal to the microcontroller or other system logic - Includes a programmable delay time for power-on reset - Offers a watchdog timer function to monitor system activity - Suitable for battery-powered applications

Package: SOT-23-5

Essence: The TPS3126E18DBVTG4 is an integrated circuit designed for power management in various electronic devices. It combines a voltage supervisor and a watchdog timer to ensure proper operation and protection of the system.

Packaging/Quantity: The TPS3126E18DBVTG4 is available in a SOT-23-5 package. It is typically sold in reels of 3000 units.

Specifications

• Supply Voltage Range: 1.2V to 6V
• Operating Temperature Range: -40°C to +85°C
• Watchdog Timer Timeout Period: 1.6s (typical)
• Reset Threshold Voltage: 1.8V (typical)
• Quiescent Current: 3µA (typical)

Pin Configuration

The TPS3126E18DBVTG4 has the following pin configuration:

```

---

| | --| VDD GND |-- Pin 1: Ground (GND) --| MR RST |-- Pin 2: Reset Output (RST) --| WDI VDD |-- Pin 3: Watchdog Input (WDI) --| NC NC |-- Pin 4: Not Connected (NC) --| NC NC |-- Pin 5: Not Connected (NC) |___________| ```

Functional Features

1. Voltage Supervision: The TPS3126E18DBVTG4 continuously monitors the supply voltage and generates a reset signal when it falls below or rises above the specified threshold.

2. Power-On Reset Delay: It includes a programmable delay time for power-on reset, allowing the system to stabilize before releasing the reset signal.

3. Watchdog Timer: The integrated watchdog timer function ensures that the system remains active by periodically receiving a signal from the microcontroller. If the signal is not received within the timeout period, a reset signal is generated.

Advantages and Disadvantages

Advantages: - Low-power consumption - Small package size - Wide operating voltage range - Programmable power-on reset delay

Disadvantages: - Limited number of available pins - Not suitable for high-voltage applications

Working Principles

The TPS3126E18DBVTG4 operates by continuously monitoring the supply voltage using an internal voltage reference. When the voltage falls below the specified threshold, the reset output is activated, signaling the microcontroller or system logic to reset. The power-on reset delay ensures that the system stabilizes before resuming normal operation. The watchdog timer function requires periodic signals from the microcontroller to prevent false resets.

Application Field Plans

The TPS3126E18DBVTG4 is commonly used in battery-powered applications where reliable power management is crucial. Some potential application fields include: - Portable electronic devices - Battery-powered IoT devices - Wearable devices - Home automation systems - Industrial control systems

Alternative Models

1. TPS3125E18DBVTG4: Similar to TPS3126E18DBVTG4 but with a different reset threshold voltage.
2. TPS3128E18DBVTG4: Similar to TPS3126E18DBVTG4 but with a higher operating temperature range.
3. TPS3129E18DBVTG4: Similar to TPS3126E18DBVTG4 but with a lower quiescent current.

These alternative models offer similar functionality and can be considered as substitutes for the TPS3126E18DBVTG4 in specific applications.

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